1.
Explain if it matters that a parent literally had nothing to do with a
biological child in order for the child to take advantage of the Family and
Medical Leave Act (FMLA) to care for that parent.

No, it does not matter
if the biological parent had nothing to do with raising the child; the employee
would still be covered by FMLA and would be able to care for his/her
parent.  FMLA defines “Parent” as “…a
person who is a biological parent or someone who stands or stood in local
parentis to an employee when the employee was a son or daughter.” 1 The law does not stipulate types of
relationship with a parent, therefore, the parent-sibling relationship is
irrelevant, one way or another.